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Compiled by Jane E. Jenness INTRODUCTION This Map Report Is DEPARTMENT OF THE INTERIOR TO ACCOMPANY UNITED STATES GEOLOGICAL SURVEY WRI REPORT 83-4122-D MAP SHOWING OUTCROPS OF GRANITIC ROCKS, BASIN AND RANGE PROVINCE, UTAH Compiled by Jane E. Jenness INTRODUCTION This map report is one of a series of geologic and hydrologic maps covering all or parts of States within the Basin and Range province of the western United States. Other map reports in this series contain data about ground-water hydrology, ground-water quality, surface distribution of selected rock types, tectonic conditions, areal geophysics, Pleistocene lakes and marshes, and mineral and energy resources. This work is a part of the U.S. Geological Survey's program for geologic and hydrologic evaluation of the province to identify prospective regions for further study relative to isolation of high-level nuclear waste (Bedinger, Sargent, and Reed, 1984). This map report was prepared from published geologic maps and reports utilizing the project guidelines defined in Sargent and Bedinger (1984) . As used in this report, granitic rocks include principally granite, quartz monzonite, and granodiorite, but also minor associated diorite, rhyolite, and latite. In the Description of Map Units, the geologic and radiometric ages, lithologic character, type of intrusive body and relation to enclosing rock units, where known, and sources of data are described for the granitic rocks within outlined and numbered areas in counties within the study area. The radiometric ages of the rock units are only those that are available and do not necessarily represent the entire age range of the units. DESCRIPTION OF MAP UNITS [To convert feet (ft) to meters, multiply feet by 0.3048] Geologic and County- radiometric age Lithology, References area Map in million of intrusive type, for number symbol years (m.y.) and comments county area BEAVER COUNTY (B) B-l Tg Tertiary Nonresistant, granular dioritic Hintze, 1974b rocks, probably occupying volcanic conduits. B-2 Tg Oligocene, Cactus stock: Medium-grained, Lemmon and 28.0 m.y. holocrystalline quartz monzonite, Morris, 1979; Part of large tabular Tertiary McKelvey, 1973; intrusive. Schmoker, 1972 B-3 Tg Oligocene Stocks, sills, and dikes of Lemmon and 28.4 m.y. granodiorite. West side of Morris, 1983; largest stock is sill-like. Lemmon and others, 1973; Welsh, 1973 B-4 Tg Oligocene Stocks and sills(?) of granite, Lemmon and 27.0 m.y. quartz monzonite, and grano­ others, 1973; diorite in the Rocky Range. Whelan, 1973 Granite crops out in northwest part, quartz monzonite in southern part, and granodiorite in east and northeast parts. Dikes intrude stocks and sur­ rounding sedimentary rocks. B-5 Tg Miocene Milford Flat stock: Medium- to Abou-Zied, 1973; 20.9 m.y. coarse-grained granodiorite and Abou-Zied and some quartz monzonite containing Whelan, 1973; stope blocks of limestone. Lemmon and others, 1973 B-6 Tg Miocene Mineral Mountains batholith: Crawford and 9 to 15 m.y. Granitic batholith with joint Buranek, 1957; plane systems striking N. 10°- Lu'edke and 20°W., and N. 80°-90° W. Smith, 1978 B-7 Tg Tertiary Monzonite to quartz monzonite, Haug, 1978 generally equigranular and fine- to medium-grained. Moderately altered. B-8 Tg Miocene and Intrusive rocks of Bullion Cunningham and Oligocene Canyon Volcanics: Steven, 1980 24.1±1.2 m.y, Mostly porphyritic to equi­ granular, fine- to medium-grained equigranular, quartz monzonite. B-9 Miocene Intrusive rocks of Mount Belknap Cunningham and 20.7 m.y. Volcanics: Several small, Steven, 1978 porphyritic quartz latitic to rhyolitic stocks. B-10 Tg Tertiary Indian Peak stock: Quartz monz­ Grant and onite porphyry; intrudes welded Best, 1979 ash flows of Indian Peak cauldron Much propylitic alteration. BOX ELDER COUNTY (BE) BE-1 Tg Tertiary Vipoint Mountain intrusion: Compton and Lineated granodiorite and others, 1977; adamellite and associated sills. Hintze, 1980 Precambrian Intrusive rocks. BE-2 Xg Early Intrusive rocks of Clear Creek Compton, 1975; Proterozoic Canyon: Metamorphosed adamellite, Compton and 2, 180±190 granular to gneissose, and others, 1977; 2,500 m.y. locally porphyritic, biotite Felix, 1956; adamellite. Todd, 1980 BE-3 Tg Oligocene Stocks of Red Butte Canyon: Compton and 24.9±0.6 Cupolas of an adamellite body others, 1977 m.y. that lies close to the surface throughout the central Grouse Creek Mountains. XWg Early Gneissose adamellite that grades Proterozoic upward, from coarse- and medium- or Late grained gneiss to fine-grained Archean gneiss and schist. Interlayed 2,510+170 with lesser quantities of grano­ m.y. diorite, tonalite, and leucocratic gneiss. BE-4 Tg Miocene to Granitic intrusive bodies of Armstrong, 1970; late Eocene Immigrant Pass. Compton and 23.3±0.5 and others, 1977 38.2±2.0 m.y. BE-5 Tg Tertiary Monzonite stock and monzonite Blue, 1963 porphyry dikes. BE-6 Jg Jurassic Stock; quartz monzonite core Carroon, 1977 149.6+4.5 m.y. and granodiorite-quartz monzonite rim. Many quartz monzonite porphyry dikes cut main intrusion. BE-7 KJg Early Stocks in Silver Island Range. Hintze, 1980; Cretaceous Crater Island quartz monzonite Schaeffer and or Late stock, largest, cut by prominent Anderson, 1960 Jurassic northeast-trending joint set. 140±3 m.y. Radiometric age from Crater Island stock. BE-8 Jg Jurassic Intrusive rocks. Hintze, 1980 IRON COUNTY (I) 1-1 Tg Miocene Three Peaks pluton: Concordant Armstrong, 1970 20 m.y. quartz monzonite-porphyry Blank and intrusion, consisting of Mackin, 1967; peripheral shell phase 50 to Bullock, 1973; 200 ft thick, altered crumbly Mackin, 1954; phase, and altered interior Mackin and phase having selvage joints. Rowley, 1976 Subsurface extent shown by Blank and Mackin (1967). 1-2 Tg Miocene Granite Mountain pluton: Same Armstrong, 1970; 20 m.y. lithology as Three Peaks pluton, Blank and county area 1-1. Mackin, 1967; Bullock, 1973; Mackin, 1954; Mackin and others, 1976 1-3 Tg Miocene Intrusive rocks of Iron Mountain: Armstrong, 1970; 22 m.y. Quartz monzonite porphyry Blank and similar to rocks described in Mackin, 1967 county areas 1-1 and 1-2. Probably considerable westward subsurface extension, as shown by aeromagnetic study (Blank and Mackin, 1967). 1-4 Tg Tertiary Stoddard Mountain laccolith and Cook, 1957 westward extension, the Paradise intrusive body: Quartz monzonite porphyry similar to other granitic rocks in Iron County. Probable westward subsurface extension. JUAB COUNTY (J) J-l Tg Tertiary Ibapah stock: Altered biotite- Armstrong, 18.7±0.4 and adamellite stock bisecting Deep 1966, 1970; 22 m.y. Creek Mountains. North and south Bick, 1966 contacts are planar faults strik­ ing N. 70° W. f and dipping 40°-70°S. Intensely fractured by six sets of cooling joints. J-2 Ti Oligocene Intrusive rocks of Desert Armstrong, 1970; 26.5±0.5 to Mountain: Oldest to youngest Calkins, 1972; 32.4±1.2 m.y. granodiorite, adamellite, Kattelman, 1968; leucogranite porphyry, quartz- Lindsey and latite porphyry, and a shallow others, 1975; rhyolite intrusive. Aeromagnetic Shawe, 1972 survey (Calkins, 1972) indicate resurgent intrusive mass at depth. J-3 Tg Oligocene or Westernmost body is West Tintic Cohenour, 1959; Eocene monzonite stock of uniform Morris, 1977 granitic texture, overlain 400 500 ft of andesite and tuff. Parts of northern outcrops called breccia pipes by Morris (1977). J-4 Tg Oligocene Silver City stock: Granular to Lindgren and 31.5+0.9 ro.y. prophyritic, medium- to fine­ Loughlin, 1919; grained, propylitically altered Morris, 1964; Silver City monzonite. Also 1975; includes plug and dikes. Morris and Lovering, 1979 Tertiary Swansea Peak stock: Northwest­ ern end of largest outcrop. Composed of medium- to fine­ grained, porphyritic Swansea Quartz Monzonite. J-5 Tg Oligocene Gough sill, Dry Ridge sill, and Mabey and >31.5 and Sunrise Peak stock: Sills, Morris, 1967; <32.8 m.y. stock, and small intrusives Morris, 1964, composed of Sunrise Peak 1975; Monzonite Porphyry. Gough Morris and sill (northern and largest Lovering, 1979 outcrop) about 500 to 1,000 ft thick. Dry Ridge sill (southernmost outcrop) 500 ft thick in cross section (Morris, 1975). Sunrise Peak stock is small, unmapped outcrop along southwest corner of Gough sill. Aeromagnetic data (Mabey and Morris, 1967) indicate an extensive igneous body under­ lies south one-half of East Tintic Mountains. J-6 Ti Oligocene Plugs and dikes composed of Morris, 1964, Sunrise Peak Monzonite Morris and Porphyry and latite porphyry Lovering, 1979 of Burnt Hollow. Latite strongly argillized, consists largely of kaolinitic clay minerals. MILLARD COUNTY (M) M-l Jg Late Jurassic Notch Peak intrusive: Jointed, Armstrong and 143±3 m.y. porphyritic quartz monzonite Suppe, 1973; stock. Southerwestern flank is Crawford and large sill about 100 ft thick, Buranek, 1957; whose roof rock is Cambrian Gehman, 1958; limestone. Recent placement Hanks, 1962; of Cretaceous-Jurassic boundary Hintze, 1974a, at 144 m.y. (Palmer, 1983) 1980: indicates possible Early Palmer, 1983 Cretaceous age. TOOELE COUNTY (T) T-l TKg Tertiary or Little Cottonwood stock: Quartz Armstrong, 1966, Cretaceous monzonite, tentatively dated as 1970; 22 and Cretaceous because it is cut by Baker and 26.2±0.5 m.y. the Charleston thrust fault Crittenden, 1961; (Late Cretaceous), radiometric Crittenden, 1965a, ages are Miocene to Oligocene. 1965b T-2 Tg Oligocene to Alta stock. Granodiorite. Armstrong, 1966, Eocene 1970; 32.8±0.7 and Crittenden, 1965b 39±6 m.y. T-3 Tg Eocene Bingham Canyon stock: Biotite- Armstrong, 1970; 37.8±0.8 and uralitized augite monzonite. Moore, 1973 41.9±0.8 ra.y. Magnetic study shows a large parent mass of monzonite under­ lying the Oquirrh Mountains; consequently, plutons in county areas T-3 through T-8 may be contiguous at depth. T-4 Tg Tertiary Intrusions of Settlement and Gilluly, 1932 Middle Canyons: Quartz monz­ onite and diorite stocks, sills, and dikes.
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